Base portion of a chair



FIG. 1 is a perspective view of a base portion of a chair.

FIG. 2 is a front view of the base portion of FIG. 1.

FIG. 3 is a rear view of the base portion of FIG. 1.

FIG. 4 is a left side view of the base portion of FIG. 1.

FIG. 5 is a right side view of the base portion of FIG. 1.

FIG. 6 is a top view of the base portion of FIG. 1; and,

FIG. 7 is a bottom view of the base portion of FIG. 1.

The broken lines in the figures illustrate the environment of theclaimed design and form no part of the claimed design.

CLAIM The ornamental design for a base portion of a chair, as shown anddescribed.